You are correct, as the down direction is considered negative. The question asked how fast it was going - so if the answer said the speed is 24.5 m/s, that would've been better.

Thank you for your comment. This video shows/proves that 0.999... is equal to 9/9, which reduces to 1. The pattern with repeating decimals that consistently have one digit repeating (e.g., 0.22222...) is that they are equal to the number being repeated over 9. This extra example of 0.22222... is equivalent to 2/9. More information on how/why 0.999999... = 1 can be found through the following links: - en.wikipedia.org/wiki/0.999... - www.purplemath.com/modules/howcan1.htm

@@audracrist8451 multiplying 0.9... by 10, by adding a 9 in front of the decimal point is an error, not a proof.

I agree. I get 47.9, which should be rounded to 48, not 47. Thanks for pointing that out.

What updated info are you looking for?

Hasshi, by using the third kinematics equation, we found that the maximum height reached from the top of the cliff was 46.2 m. That was added to the height of the cliff (95 m), getting an answer of 141 m. The problem could've asked what was the maximum height above ground level - the bottom of the cliff - and it may have been clearer. John

Glad it helped!

Mikhael, This is a tricky one. But, let's start with projectile motion - we break the motion into x and y components that are independent of each other. "g" will not affect motion in the x direction, only the y. For this problem, to make the math easier, we created a coordinate system in 3 directions - the vt, 1/2 gt^2, and r directions. So, g is only affecting the motion in the 1/2 gt^2 direction. All three are independent of each other.